import java.util.ArrayList;
import java.util.Collection;

public class StudentTest {
    public static void main(String[] args) {

        Collection c1=new ArrayList();
        c1.add(new Student("ikun1",18));
        c1.add(new Student("ikun2",19));
        c1.add(new Student("ikun3",20));
        System.out.println(c1);

        Collection <Student> c2=new ArrayList<Student>();
    }
}
